Enable eslint rule 'no-prototype-builtins'

Enable recommended rule 'no-prototype-builtins' [1] and manually fix violations.

[1] https://eslint.org/docs/latest/rules/no-prototype-builtins

Ref: #8068
Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>

eslint.config.mjs

@@ -61,6 +61,7 @@ const configEslintRecommended = {
 		"no-nonoctal-decimal-escape": "warn",
 		"no-obj-calls": "warn",
 		"no-octal": "warn",
+		"no-prototype-builtins": "warn",
 		"no-redeclare": "warn",
 		"no-regex-spaces": "warn",
 		"no-self-assign": "warn",